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本文比较了1.5T、3T和7T磁共振介电特性断层成像(MR EPT)核心算法在介电特性非均匀组织中的重建误差。首先,建立介电特性非均匀的电磁模型,仿真计算该模型在不同场强电磁场下的射频发射电磁场分布;其次,利用MR EPT核心算法计算得到成像区域组织介电特性分布;最后,比较不同场强非均匀组织介电特性重建结果的误差。结果表明,当场强为1.5T时,重建结果最大相对误差和平均相对误差都最大,而在7T场强下,重建结果的最大相对误差和平均相对误差都最小,不同场强下该算法的重建误差不同,重建误差随场强的增大而减小。
This article compares the 1.5T, 3T, and 7T magnetic resonance tomosynthesis (MREPT) core algorithms for reconstruction error in non-uniform dielectric properties. Firstly, the electromagnetic model with non-uniform dielectric property is established, and the electromagnetic field distribution of the model under different electromagnetic fields is calculated by simulation. Secondly, the distribution of dielectric properties in the imaging region is calculated by the MR EPT core algorithm. Finally, Error in reconstruction results of dielectric properties in strongly inhomogeneous tissues. The results show that when the field strength is 1.5T, the maximum relative error and the average relative error of the reconstruction result are the largest, while the maximum relative error and the average relative error of the reconstruction result are the smallest under the field strength of 7T. The reconstruction of the algorithm under different field strengths Different errors, reconstruction error decreases with increasing field strength.